| IMPROVED PROPERTIES OF METALLOCENE-CATALYZED LINEAR LOW-DENSITY POLYETHYLENE/POLYPROPYLENE BLENDS DURING ULTRASONIC EXTRUSION |
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| 作者姓名： | Hong Wu Shao-yun Guo |
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| 作者单位： | [1]The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China [2]Key Laboratory of Rubber-Plastics （Qingdao University of Science and Technology）, Ministry of Education, Qingdao 266042, China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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国家自然科学基金
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the Open Foundation of Key Laboratory of Rubber-plastics (QUST), Ministry of Education, China and the Foundation for Youth of Sichuan University |
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| 摘 要： | Metallocene-catalyzed linear low-density polyethylene/polypropylene （mLLDPE/PP） blends were prepared by ultrasonic extrusion in this work. Their extrusion processing behaviors were estimated by online measured data, such as the die pressure and flow rate. Crystallization and mechanical properties of the blends were also investigated. The results show that the addition of PP improves the processing behaviors of mLLDPE, but has little effect on its mechanical properties. On the other hand, the addition of mLLDPE improves the impact strength of PP, but has little effect on its processing behavior. The processing behaviors and mechanical properties of mLLDPE/PP blends get further improved due to the presence of ultrasonic oscillation during extrusion. Compared with PP-rich blends, the apparent viscosity drop of mLLDPE-rich blends is more sensitive to ultrasonic oscillation. The ultrasonic oscillation affects the crystal nucleation, while barely the other crystalline behaviors of the blends.
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| 关 键 词： | 超声波挤压 聚乙烯 聚丙烯 线性低密度混合物 |
| 收稿时间： | 2006-07-17 |
| 修稿时间： | 2006-07-172006-09-27 |
IMPROVED PROPERTIES OF METALLOCENE-CATALYZED LINEAR LOW DENSITY POLYETHYLENE/POLYPROPYLENE BLENDS DURING ULTRASONIC EXTRUSION |
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| Hong Wu Shao-yun Guo.IMPROVED PROPERTIES OF METALLOCENE-CATALYZED LINEAR LOW-DENSITY POLYETHYLENE/POLYPROPYLENE BLENDS DURING ULTRASONIC EXTRUSION[J].Chinese Journal of Polymer Science,2007,0(4):357-364. |
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| Authors: | Hong Wu Shao-yun Guo |
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| Institution: | Qingdao University of Science and Technology |
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| Abstract: | Metallocene-catalyzed linear low-density polyethylene/polypropylene (mLLDPE/PP) blends were prepared by ultrasonic extrusion in this work. Their extrusion processing behaviors were estimated by online measured data, such as the die pressure and flow rate. Crystallization and mechanical properties of the blends were also investigated. The results show that the addition of PP improves the processing behaviors of mLLDPE, but has little effect on its mechanical properties. On the other hand, the addition of mLLDPE improves the impact strength of PP, but has little effect on its processing behavior. The processing behaviors and mechanical properties of mLLDPE/PP blends get further improved due to the presence of ultrasonic oscillation during extrusion. Compared with PP-rich blends, the apparent viscosity drop of mLLDPE-rich blends is more sensitive to ultrasonic oscillation. The ultrasonic oscillation affects the crystal nucleation, while barely the other crystalline behaviors of the blends. |
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| Keywords: | mLLDPE PP Blends Properties Ultrasonic extrusion |
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